http://git-wip-us.apache.org/repos/asf/hbase-site/blob/f183e80f/devapidocs/src-html/org/apache/hadoop/hbase/wal/WALFactory.Providers.html
----------------------------------------------------------------------
diff --git
a/devapidocs/src-html/org/apache/hadoop/hbase/wal/WALFactory.Providers.html
b/devapidocs/src-html/org/apache/hadoop/hbase/wal/WALFactory.Providers.html
index fadf667..14b2b69 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/wal/WALFactory.Providers.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/wal/WALFactory.Providers.html
@@ -7,269 +7,269 @@
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
-<span class="sourceLineNo">002</span> *<a name="line.2"></a>
-<span class="sourceLineNo">003</span> * Licensed to the Apache Software
Foundation (ASF) under one<a name="line.3"></a>
-<span class="sourceLineNo">004</span> * or more contributor license
agreements. See the NOTICE file<a name="line.4"></a>
-<span class="sourceLineNo">005</span> * distributed with this work for
additional information<a name="line.5"></a>
-<span class="sourceLineNo">006</span> * regarding copyright ownership. The
ASF licenses this file<a name="line.6"></a>
-<span class="sourceLineNo">007</span> * to you under the Apache License,
Version 2.0 (the<a name="line.7"></a>
-<span class="sourceLineNo">008</span> * "License"); you may not use this file
except in compliance<a name="line.8"></a>
-<span class="sourceLineNo">009</span> * with the License. You may obtain a
copy of the License at<a name="line.9"></a>
-<span class="sourceLineNo">010</span> *<a name="line.10"></a>
-<span class="sourceLineNo">011</span> *
http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a>
-<span class="sourceLineNo">012</span> *<a name="line.12"></a>
-<span class="sourceLineNo">013</span> * Unless required by applicable law or
agreed to in writing, software<a name="line.13"></a>
-<span class="sourceLineNo">014</span> * distributed under the License is
distributed on an "AS IS" BASIS,<a name="line.14"></a>
-<span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF
ANY KIND, either express or implied.<a name="line.15"></a>
-<span class="sourceLineNo">016</span> * See the License for the specific
language governing permissions and<a name="line.16"></a>
-<span class="sourceLineNo">017</span> * limitations under the License.<a
name="line.17"></a>
-<span class="sourceLineNo">018</span> */<a name="line.18"></a>
+<span class="sourceLineNo">002</span> * Licensed to the Apache Software
Foundation (ASF) under one<a name="line.2"></a>
+<span class="sourceLineNo">003</span> * or more contributor license
agreements. See the NOTICE file<a name="line.3"></a>
+<span class="sourceLineNo">004</span> * distributed with this work for
additional information<a name="line.4"></a>
+<span class="sourceLineNo">005</span> * regarding copyright ownership. The
ASF licenses this file<a name="line.5"></a>
+<span class="sourceLineNo">006</span> * to you under the Apache License,
Version 2.0 (the<a name="line.6"></a>
+<span class="sourceLineNo">007</span> * "License"); you may not use this file
except in compliance<a name="line.7"></a>
+<span class="sourceLineNo">008</span> * with the License. You may obtain a
copy of the License at<a name="line.8"></a>
+<span class="sourceLineNo">009</span> *<a name="line.9"></a>
+<span class="sourceLineNo">010</span> *
http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
+<span class="sourceLineNo">011</span> *<a name="line.11"></a>
+<span class="sourceLineNo">012</span> * Unless required by applicable law or
agreed to in writing, software<a name="line.12"></a>
+<span class="sourceLineNo">013</span> * distributed under the License is
distributed on an "AS IS" BASIS,<a name="line.13"></a>
+<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF
ANY KIND, either express or implied.<a name="line.14"></a>
+<span class="sourceLineNo">015</span> * See the License for the specific
language governing permissions and<a name="line.15"></a>
+<span class="sourceLineNo">016</span> * limitations under the License.<a
name="line.16"></a>
+<span class="sourceLineNo">017</span> */<a name="line.17"></a>
+<span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.wal;<a
name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
-<span class="sourceLineNo">020</span><a name="line.20"></a>
-<span class="sourceLineNo">021</span>package org.apache.hadoop.hbase.wal;<a
name="line.21"></a>
-<span class="sourceLineNo">022</span><a name="line.22"></a>
-<span class="sourceLineNo">023</span>import
org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a
name="line.23"></a>
-<span class="sourceLineNo">024</span><a name="line.24"></a>
-<span class="sourceLineNo">025</span>import java.io.IOException;<a
name="line.25"></a>
-<span class="sourceLineNo">026</span>import java.io.InterruptedIOException;<a
name="line.26"></a>
-<span class="sourceLineNo">027</span>import java.util.Collections;<a
name="line.27"></a>
-<span class="sourceLineNo">028</span>import java.util.List;<a
name="line.28"></a>
-<span class="sourceLineNo">029</span>import java.util.OptionalLong;<a
name="line.29"></a>
-<span class="sourceLineNo">030</span>import
java.util.concurrent.atomic.AtomicReference;<a name="line.30"></a>
-<span class="sourceLineNo">031</span><a name="line.31"></a>
-<span class="sourceLineNo">032</span>import
org.apache.hadoop.conf.Configuration;<a name="line.32"></a>
-<span class="sourceLineNo">033</span>import org.apache.hadoop.fs.FileSystem;<a
name="line.33"></a>
-<span class="sourceLineNo">034</span>import org.apache.hadoop.fs.Path;<a
name="line.34"></a>
-<span class="sourceLineNo">035</span>import
org.apache.yetus.audience.InterfaceAudience;<a name="line.35"></a>
-<span class="sourceLineNo">036</span>import org.slf4j.Logger;<a
name="line.36"></a>
-<span class="sourceLineNo">037</span>import org.slf4j.LoggerFactory;<a
name="line.37"></a>
-<span class="sourceLineNo">038</span>// imports for things that haven't moved
from regionserver.wal yet.<a name="line.38"></a>
-<span class="sourceLineNo">039</span>import
org.apache.hadoop.hbase.regionserver.wal.MetricsWAL;<a name="line.39"></a>
-<span class="sourceLineNo">040</span>import
org.apache.hadoop.hbase.regionserver.wal.ProtobufLogReader;<a
name="line.40"></a>
-<span class="sourceLineNo">041</span>import
org.apache.hadoop.hbase.regionserver.wal.WALActionsListener;<a
name="line.41"></a>
-<span class="sourceLineNo">042</span>import
org.apache.hadoop.hbase.replication.regionserver.WALFileLengthProvider;<a
name="line.42"></a>
-<span class="sourceLineNo">043</span>import
org.apache.hadoop.hbase.util.CancelableProgressable;<a name="line.43"></a>
-<span class="sourceLineNo">044</span>import
org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.44"></a>
-<span class="sourceLineNo">045</span>import
org.apache.hadoop.hbase.util.LeaseNotRecoveredException;<a name="line.45"></a>
-<span class="sourceLineNo">046</span>import
org.apache.hadoop.hbase.wal.WAL.Reader;<a name="line.46"></a>
-<span class="sourceLineNo">047</span>import
org.apache.hadoop.hbase.wal.WALProvider.Writer;<a name="line.47"></a>
-<span class="sourceLineNo">048</span><a name="line.48"></a>
-<span class="sourceLineNo">049</span>/**<a name="line.49"></a>
-<span class="sourceLineNo">050</span> * Entry point for users of the Write
Ahead Log.<a name="line.50"></a>
-<span class="sourceLineNo">051</span> * Acts as the shim between internal use
and the particular WALProvider we use to handle wal<a name="line.51"></a>
-<span class="sourceLineNo">052</span> * requests.<a name="line.52"></a>
-<span class="sourceLineNo">053</span> *<a name="line.53"></a>
-<span class="sourceLineNo">054</span> * Configure which provider gets used
with the configuration setting "hbase.wal.provider". Available<a
name="line.54"></a>
-<span class="sourceLineNo">055</span> * implementations:<a name="line.55"></a>
-<span class="sourceLineNo">056</span> * <ul><a name="line.56"></a>
-<span class="sourceLineNo">057</span> *
<li><em>defaultProvider</em> : whatever provider is standard
for the hbase version. Currently<a name="line.57"></a>
-<span class="sourceLineNo">058</span> *
"filesystem"</li><a name="line.58"></a>
-<span class="sourceLineNo">059</span> *
<li><em>filesystem</em> : a provider that will run on top of
an implementation of the Hadoop<a name="line.59"></a>
-<span class="sourceLineNo">060</span> * FileSystem
interface, normally HDFS.</li><a name="line.60"></a>
-<span class="sourceLineNo">061</span> *
<li><em>multiwal</em> : a provider that will use multiple
"filesystem" wal instances per region<a name="line.61"></a>
-<span class="sourceLineNo">062</span> *
server.</li><a name="line.62"></a>
-<span class="sourceLineNo">063</span> * </ul><a name="line.63"></a>
-<span class="sourceLineNo">064</span> *<a name="line.64"></a>
-<span class="sourceLineNo">065</span> * Alternatively, you may provide a
custom implementation of {@link WALProvider} by class name.<a
name="line.65"></a>
-<span class="sourceLineNo">066</span> */<a name="line.66"></a>
-<span class="sourceLineNo">067</span>@InterfaceAudience.Private<a
name="line.67"></a>
-<span class="sourceLineNo">068</span>public class WALFactory implements
WALFileLengthProvider {<a name="line.68"></a>
-<span class="sourceLineNo">069</span><a name="line.69"></a>
-<span class="sourceLineNo">070</span> private static final Logger LOG =
LoggerFactory.getLogger(WALFactory.class);<a name="line.70"></a>
-<span class="sourceLineNo">071</span><a name="line.71"></a>
-<span class="sourceLineNo">072</span> /**<a name="line.72"></a>
-<span class="sourceLineNo">073</span> * Maps between configuration names for
providers and implementation classes.<a name="line.73"></a>
-<span class="sourceLineNo">074</span> */<a name="line.74"></a>
-<span class="sourceLineNo">075</span> static enum Providers {<a
name="line.75"></a>
-<span class="sourceLineNo">076</span>
defaultProvider(AsyncFSWALProvider.class),<a name="line.76"></a>
-<span class="sourceLineNo">077</span> filesystem(FSHLogProvider.class),<a
name="line.77"></a>
-<span class="sourceLineNo">078</span>
multiwal(RegionGroupingProvider.class),<a name="line.78"></a>
-<span class="sourceLineNo">079</span> asyncfs(AsyncFSWALProvider.class);<a
name="line.79"></a>
-<span class="sourceLineNo">080</span><a name="line.80"></a>
-<span class="sourceLineNo">081</span> Class<? extends WALProvider>
clazz;<a name="line.81"></a>
-<span class="sourceLineNo">082</span> Providers(Class<? extends
WALProvider> clazz) {<a name="line.82"></a>
-<span class="sourceLineNo">083</span> this.clazz = clazz;<a
name="line.83"></a>
-<span class="sourceLineNo">084</span> }<a name="line.84"></a>
-<span class="sourceLineNo">085</span> }<a name="line.85"></a>
+<span class="sourceLineNo">020</span>import java.io.IOException;<a
name="line.20"></a>
+<span class="sourceLineNo">021</span>import java.io.InterruptedIOException;<a
name="line.21"></a>
+<span class="sourceLineNo">022</span>import java.util.Collections;<a
name="line.22"></a>
+<span class="sourceLineNo">023</span>import java.util.List;<a
name="line.23"></a>
+<span class="sourceLineNo">024</span>import java.util.OptionalLong;<a
name="line.24"></a>
+<span class="sourceLineNo">025</span>import
java.util.concurrent.atomic.AtomicReference;<a name="line.25"></a>
+<span class="sourceLineNo">026</span>import
org.apache.hadoop.conf.Configuration;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import org.apache.hadoop.fs.FileSystem;<a
name="line.27"></a>
+<span class="sourceLineNo">028</span>import org.apache.hadoop.fs.Path;<a
name="line.28"></a>
+<span class="sourceLineNo">029</span>import
org.apache.hadoop.hbase.client.RegionInfo;<a name="line.29"></a>
+<span class="sourceLineNo">030</span>// imports for things that haven't moved
from regionserver.wal yet.<a name="line.30"></a>
+<span class="sourceLineNo">031</span>import
org.apache.hadoop.hbase.regionserver.wal.MetricsWAL;<a name="line.31"></a>
+<span class="sourceLineNo">032</span>import
org.apache.hadoop.hbase.regionserver.wal.ProtobufLogReader;<a
name="line.32"></a>
+<span class="sourceLineNo">033</span>import
org.apache.hadoop.hbase.regionserver.wal.WALActionsListener;<a
name="line.33"></a>
+<span class="sourceLineNo">034</span>import
org.apache.hadoop.hbase.replication.regionserver.WALFileLengthProvider;<a
name="line.34"></a>
+<span class="sourceLineNo">035</span>import
org.apache.hadoop.hbase.util.CancelableProgressable;<a name="line.35"></a>
+<span class="sourceLineNo">036</span>import
org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.36"></a>
+<span class="sourceLineNo">037</span>import
org.apache.hadoop.hbase.util.LeaseNotRecoveredException;<a name="line.37"></a>
+<span class="sourceLineNo">038</span>import
org.apache.hadoop.hbase.wal.WAL.Reader;<a name="line.38"></a>
+<span class="sourceLineNo">039</span>import
org.apache.hadoop.hbase.wal.WALProvider.Writer;<a name="line.39"></a>
+<span class="sourceLineNo">040</span>import
org.apache.yetus.audience.InterfaceAudience;<a name="line.40"></a>
+<span class="sourceLineNo">041</span>import org.slf4j.Logger;<a
name="line.41"></a>
+<span class="sourceLineNo">042</span>import org.slf4j.LoggerFactory;<a
name="line.42"></a>
+<span class="sourceLineNo">043</span><a name="line.43"></a>
+<span class="sourceLineNo">044</span>import
org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a
name="line.44"></a>
+<span class="sourceLineNo">045</span><a name="line.45"></a>
+<span class="sourceLineNo">046</span>/**<a name="line.46"></a>
+<span class="sourceLineNo">047</span> * Entry point for users of the Write
Ahead Log.<a name="line.47"></a>
+<span class="sourceLineNo">048</span> * Acts as the shim between internal use
and the particular WALProvider we use to handle wal<a name="line.48"></a>
+<span class="sourceLineNo">049</span> * requests.<a name="line.49"></a>
+<span class="sourceLineNo">050</span> *<a name="line.50"></a>
+<span class="sourceLineNo">051</span> * Configure which provider gets used
with the configuration setting "hbase.wal.provider". Available<a
name="line.51"></a>
+<span class="sourceLineNo">052</span> * implementations:<a name="line.52"></a>
+<span class="sourceLineNo">053</span> * <ul><a name="line.53"></a>
+<span class="sourceLineNo">054</span> *
<li><em>defaultProvider</em> : whatever provider is standard
for the hbase version. Currently<a name="line.54"></a>
+<span class="sourceLineNo">055</span> *
"filesystem"</li><a name="line.55"></a>
+<span class="sourceLineNo">056</span> *
<li><em>filesystem</em> : a provider that will run on top of
an implementation of the Hadoop<a name="line.56"></a>
+<span class="sourceLineNo">057</span> * FileSystem
interface, normally HDFS.</li><a name="line.57"></a>
+<span class="sourceLineNo">058</span> *
<li><em>multiwal</em> : a provider that will use multiple
"filesystem" wal instances per region<a name="line.58"></a>
+<span class="sourceLineNo">059</span> *
server.</li><a name="line.59"></a>
+<span class="sourceLineNo">060</span> * </ul><a name="line.60"></a>
+<span class="sourceLineNo">061</span> *<a name="line.61"></a>
+<span class="sourceLineNo">062</span> * Alternatively, you may provide a
custom implementation of {@link WALProvider} by class name.<a
name="line.62"></a>
+<span class="sourceLineNo">063</span> */<a name="line.63"></a>
+<span class="sourceLineNo">064</span>@InterfaceAudience.Private<a
name="line.64"></a>
+<span class="sourceLineNo">065</span>public class WALFactory implements
WALFileLengthProvider {<a name="line.65"></a>
+<span class="sourceLineNo">066</span><a name="line.66"></a>
+<span class="sourceLineNo">067</span> private static final Logger LOG =
LoggerFactory.getLogger(WALFactory.class);<a name="line.67"></a>
+<span class="sourceLineNo">068</span><a name="line.68"></a>
+<span class="sourceLineNo">069</span> /**<a name="line.69"></a>
+<span class="sourceLineNo">070</span> * Maps between configuration names for
providers and implementation classes.<a name="line.70"></a>
+<span class="sourceLineNo">071</span> */<a name="line.71"></a>
+<span class="sourceLineNo">072</span> static enum Providers {<a
name="line.72"></a>
+<span class="sourceLineNo">073</span>
defaultProvider(AsyncFSWALProvider.class),<a name="line.73"></a>
+<span class="sourceLineNo">074</span> filesystem(FSHLogProvider.class),<a
name="line.74"></a>
+<span class="sourceLineNo">075</span>
multiwal(RegionGroupingProvider.class),<a name="line.75"></a>
+<span class="sourceLineNo">076</span> asyncfs(AsyncFSWALProvider.class);<a
name="line.76"></a>
+<span class="sourceLineNo">077</span><a name="line.77"></a>
+<span class="sourceLineNo">078</span> Class<? extends WALProvider>
clazz;<a name="line.78"></a>
+<span class="sourceLineNo">079</span> Providers(Class<? extends
WALProvider> clazz) {<a name="line.79"></a>
+<span class="sourceLineNo">080</span> this.clazz = clazz;<a
name="line.80"></a>
+<span class="sourceLineNo">081</span> }<a name="line.81"></a>
+<span class="sourceLineNo">082</span> }<a name="line.82"></a>
+<span class="sourceLineNo">083</span><a name="line.83"></a>
+<span class="sourceLineNo">084</span> public static final String WAL_PROVIDER
= "hbase.wal.provider";<a name="line.84"></a>
+<span class="sourceLineNo">085</span> static final String
DEFAULT_WAL_PROVIDER = Providers.defaultProvider.name();<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
-<span class="sourceLineNo">087</span> public static final String WAL_PROVIDER
= "hbase.wal.provider";<a name="line.87"></a>
-<span class="sourceLineNo">088</span> static final String
DEFAULT_WAL_PROVIDER = Providers.defaultProvider.name();<a name="line.88"></a>
+<span class="sourceLineNo">087</span> public static final String
META_WAL_PROVIDER = "hbase.wal.meta_provider";<a name="line.87"></a>
+<span class="sourceLineNo">088</span> static final String
DEFAULT_META_WAL_PROVIDER = Providers.defaultProvider.name();<a
name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
-<span class="sourceLineNo">090</span> public static final String
META_WAL_PROVIDER = "hbase.wal.meta_provider";<a name="line.90"></a>
-<span class="sourceLineNo">091</span> static final String
DEFAULT_META_WAL_PROVIDER = Providers.defaultProvider.name();<a
name="line.91"></a>
-<span class="sourceLineNo">092</span><a name="line.92"></a>
-<span class="sourceLineNo">093</span> final String factoryId;<a
name="line.93"></a>
-<span class="sourceLineNo">094</span> final WALProvider provider;<a
name="line.94"></a>
-<span class="sourceLineNo">095</span> // The meta updates are written to a
different wal. If this<a name="line.95"></a>
-<span class="sourceLineNo">096</span> // regionserver holds meta regions,
then this ref will be non-null.<a name="line.96"></a>
-<span class="sourceLineNo">097</span> // lazily intialized; most
RegionServers don't deal with META<a name="line.97"></a>
-<span class="sourceLineNo">098</span> final
AtomicReference<WALProvider> metaProvider = new
AtomicReference<>();<a name="line.98"></a>
-<span class="sourceLineNo">099</span><a name="line.99"></a>
-<span class="sourceLineNo">100</span> /**<a name="line.100"></a>
-<span class="sourceLineNo">101</span> * Configuration-specified WAL Reader
used when a custom reader is requested<a name="line.101"></a>
-<span class="sourceLineNo">102</span> */<a name="line.102"></a>
-<span class="sourceLineNo">103</span> private final Class<? extends
AbstractFSWALProvider.Reader> logReaderClass;<a name="line.103"></a>
-<span class="sourceLineNo">104</span><a name="line.104"></a>
-<span class="sourceLineNo">105</span> /**<a name="line.105"></a>
-<span class="sourceLineNo">106</span> * How long to attempt opening
in-recovery wals<a name="line.106"></a>
-<span class="sourceLineNo">107</span> */<a name="line.107"></a>
-<span class="sourceLineNo">108</span> private final int timeoutMillis;<a
name="line.108"></a>
-<span class="sourceLineNo">109</span><a name="line.109"></a>
-<span class="sourceLineNo">110</span> private final Configuration conf;<a
name="line.110"></a>
-<span class="sourceLineNo">111</span><a name="line.111"></a>
-<span class="sourceLineNo">112</span> // Used for the singleton WALFactory,
see below.<a name="line.112"></a>
-<span class="sourceLineNo">113</span> private WALFactory(Configuration conf)
{<a name="line.113"></a>
-<span class="sourceLineNo">114</span> // this code is duplicated here so we
can keep our members final.<a name="line.114"></a>
-<span class="sourceLineNo">115</span> // until we've moved reader/writer
construction down into providers, this initialization must<a
name="line.115"></a>
-<span class="sourceLineNo">116</span> // happen prior to provider
initialization, in case they need to instantiate a reader/writer.<a
name="line.116"></a>
-<span class="sourceLineNo">117</span> timeoutMillis =
conf.getInt("hbase.hlog.open.timeout", 300000);<a name="line.117"></a>
-<span class="sourceLineNo">118</span> /* TODO Both of these are probably
specific to the fs wal provider */<a name="line.118"></a>
-<span class="sourceLineNo">119</span> logReaderClass =
conf.getClass("hbase.regionserver.hlog.reader.impl", ProtobufLogReader.class,<a
name="line.119"></a>
-<span class="sourceLineNo">120</span>
AbstractFSWALProvider.Reader.class);<a name="line.120"></a>
-<span class="sourceLineNo">121</span> this.conf = conf;<a
name="line.121"></a>
-<span class="sourceLineNo">122</span> // end required early
initialization<a name="line.122"></a>
-<span class="sourceLineNo">123</span><a name="line.123"></a>
-<span class="sourceLineNo">124</span> // this instance can't create wals,
just reader/writers.<a name="line.124"></a>
-<span class="sourceLineNo">125</span> provider = null;<a
name="line.125"></a>
-<span class="sourceLineNo">126</span> factoryId = SINGLETON_ID;<a
name="line.126"></a>
-<span class="sourceLineNo">127</span> }<a name="line.127"></a>
-<span class="sourceLineNo">128</span><a name="line.128"></a>
-<span class="sourceLineNo">129</span> @VisibleForTesting<a
name="line.129"></a>
-<span class="sourceLineNo">130</span> public Class<? extends
WALProvider> getProviderClass(String key, String defaultValue) {<a
name="line.130"></a>
-<span class="sourceLineNo">131</span> try {<a name="line.131"></a>
-<span class="sourceLineNo">132</span> return
Providers.valueOf(conf.get(key, defaultValue)).clazz;<a name="line.132"></a>
-<span class="sourceLineNo">133</span> } catch (IllegalArgumentException
exception) {<a name="line.133"></a>
-<span class="sourceLineNo">134</span> // Fall back to them specifying a
class name<a name="line.134"></a>
-<span class="sourceLineNo">135</span> // Note that the passed default
class shouldn't actually be used, since the above only fails<a
name="line.135"></a>
-<span class="sourceLineNo">136</span> // when there is a config value
present.<a name="line.136"></a>
-<span class="sourceLineNo">137</span> return conf.getClass(key,
Providers.defaultProvider.clazz, WALProvider.class);<a name="line.137"></a>
-<span class="sourceLineNo">138</span> }<a name="line.138"></a>
-<span class="sourceLineNo">139</span> }<a name="line.139"></a>
-<span class="sourceLineNo">140</span><a name="line.140"></a>
-<span class="sourceLineNo">141</span> WALProvider createProvider(Class<?
extends WALProvider> clazz,<a name="line.141"></a>
-<span class="sourceLineNo">142</span> List<WALActionsListener>
listeners, String providerId) throws IOException {<a name="line.142"></a>
-<span class="sourceLineNo">143</span> LOG.info("Instantiating WALProvider
of type " + clazz);<a name="line.143"></a>
-<span class="sourceLineNo">144</span> try {<a name="line.144"></a>
-<span class="sourceLineNo">145</span> final WALProvider result =
clazz.newInstance();<a name="line.145"></a>
-<span class="sourceLineNo">146</span> result.init(this, conf, listeners,
providerId);<a name="line.146"></a>
-<span class="sourceLineNo">147</span> return result;<a
name="line.147"></a>
-<span class="sourceLineNo">148</span> } catch (InstantiationException
exception) {<a name="line.148"></a>
-<span class="sourceLineNo">149</span> LOG.error("couldn't set up
WALProvider, the configured class is " + clazz);<a name="line.149"></a>
-<span class="sourceLineNo">150</span> LOG.debug("Exception details for
failure to load WALProvider.", exception);<a name="line.150"></a>
-<span class="sourceLineNo">151</span> throw new IOException("couldn't set
up WALProvider", exception);<a name="line.151"></a>
-<span class="sourceLineNo">152</span> } catch (IllegalAccessException
exception) {<a name="line.152"></a>
-<span class="sourceLineNo">153</span> LOG.error("couldn't set up
WALProvider, the configured class is " + clazz);<a name="line.153"></a>
-<span class="sourceLineNo">154</span> LOG.debug("Exception details for
failure to load WALProvider.", exception);<a name="line.154"></a>
-<span class="sourceLineNo">155</span> throw new IOException("couldn't set
up WALProvider", exception);<a name="line.155"></a>
-<span class="sourceLineNo">156</span> }<a name="line.156"></a>
-<span class="sourceLineNo">157</span> }<a name="line.157"></a>
-<span class="sourceLineNo">158</span><a name="line.158"></a>
-<span class="sourceLineNo">159</span> /**<a name="line.159"></a>
-<span class="sourceLineNo">160</span> * instantiate a provider from a config
property.<a name="line.160"></a>
-<span class="sourceLineNo">161</span> * requires conf to have already been
set (as well as anything the provider might need to read).<a
name="line.161"></a>
-<span class="sourceLineNo">162</span> */<a name="line.162"></a>
-<span class="sourceLineNo">163</span> WALProvider getProvider(final String
key, final String defaultValue,<a name="line.163"></a>
-<span class="sourceLineNo">164</span> final
List<WALActionsListener> listeners, final String providerId) throws
IOException {<a name="line.164"></a>
-<span class="sourceLineNo">165</span> Class<? extends WALProvider>
clazz = getProviderClass(key, defaultValue);<a name="line.165"></a>
-<span class="sourceLineNo">166</span> return createProvider(clazz,
listeners, providerId);<a name="line.166"></a>
-<span class="sourceLineNo">167</span> }<a name="line.167"></a>
-<span class="sourceLineNo">168</span><a name="line.168"></a>
-<span class="sourceLineNo">169</span> /**<a name="line.169"></a>
-<span class="sourceLineNo">170</span> * @param conf must not be null, will
keep a reference to read params in later reader/writer<a name="line.170"></a>
-<span class="sourceLineNo">171</span> * instances.<a name="line.171"></a>
-<span class="sourceLineNo">172</span> * @param listeners may be null. will
be given to all created wals (and not meta-wals)<a name="line.172"></a>
-<span class="sourceLineNo">173</span> * @param factoryId a unique identifier
for this factory. used i.e. by filesystem implementations<a name="line.173"></a>
-<span class="sourceLineNo">174</span> * to make a directory<a
name="line.174"></a>
-<span class="sourceLineNo">175</span> */<a name="line.175"></a>
-<span class="sourceLineNo">176</span> public WALFactory(final Configuration
conf, final List<WALActionsListener> listeners,<a name="line.176"></a>
-<span class="sourceLineNo">177</span> final String factoryId) throws
IOException {<a name="line.177"></a>
-<span class="sourceLineNo">178</span> // until we've moved reader/writer
construction down into providers, this initialization must<a
name="line.178"></a>
-<span class="sourceLineNo">179</span> // happen prior to provider
initialization, in case they need to instantiate a reader/writer.<a
name="line.179"></a>
-<span class="sourceLineNo">180</span> timeoutMillis =
conf.getInt("hbase.hlog.open.timeout", 300000);<a name="line.180"></a>
-<span class="sourceLineNo">181</span> /* TODO Both of these are probably
specific to the fs wal provider */<a name="line.181"></a>
-<span class="sourceLineNo">182</span> logReaderClass =
conf.getClass("hbase.regionserver.hlog.reader.impl", ProtobufLogReader.class,<a
name="line.182"></a>
-<span class="sourceLineNo">183</span>
AbstractFSWALProvider.Reader.class);<a name="line.183"></a>
-<span class="sourceLineNo">184</span> this.conf = conf;<a
name="line.184"></a>
-<span class="sourceLineNo">185</span> this.factoryId = factoryId;<a
name="line.185"></a>
-<span class="sourceLineNo">186</span> // end required early
initialization<a name="line.186"></a>
-<span class="sourceLineNo">187</span> if
(conf.getBoolean("hbase.regionserver.hlog.enabled", true)) {<a
name="line.187"></a>
-<span class="sourceLineNo">188</span> provider =
getProvider(WAL_PROVIDER, DEFAULT_WAL_PROVIDER, listeners, null);<a
name="line.188"></a>
-<span class="sourceLineNo">189</span> } else {<a name="line.189"></a>
-<span class="sourceLineNo">190</span> // special handling of existing
configuration behavior.<a name="line.190"></a>
-<span class="sourceLineNo">191</span> LOG.warn("Running with WAL
disabled.");<a name="line.191"></a>
-<span class="sourceLineNo">192</span> provider = new
DisabledWALProvider();<a name="line.192"></a>
-<span class="sourceLineNo">193</span> provider.init(this, conf, null,
factoryId);<a name="line.193"></a>
-<span class="sourceLineNo">194</span> }<a name="line.194"></a>
-<span class="sourceLineNo">195</span> }<a name="line.195"></a>
-<span class="sourceLineNo">196</span><a name="line.196"></a>
-<span class="sourceLineNo">197</span> /**<a name="line.197"></a>
-<span class="sourceLineNo">198</span> * Shutdown all WALs and clean up any
underlying storage.<a name="line.198"></a>
-<span class="sourceLineNo">199</span> * Use only when you will not need to
replay and edits that have gone to any wals from this<a name="line.199"></a>
-<span class="sourceLineNo">200</span> * factory.<a name="line.200"></a>
-<span class="sourceLineNo">201</span> */<a name="line.201"></a>
-<span class="sourceLineNo">202</span> public void close() throws IOException
{<a name="line.202"></a>
-<span class="sourceLineNo">203</span> final WALProvider metaProvider =
this.metaProvider.get();<a name="line.203"></a>
-<span class="sourceLineNo">204</span> if (null != metaProvider) {<a
name="line.204"></a>
-<span class="sourceLineNo">205</span> metaProvider.close();<a
name="line.205"></a>
-<span class="sourceLineNo">206</span> }<a name="line.206"></a>
-<span class="sourceLineNo">207</span> // close is called on a WALFactory
with null provider in the case of contention handling<a name="line.207"></a>
-<span class="sourceLineNo">208</span> // within the getInstance method.<a
name="line.208"></a>
-<span class="sourceLineNo">209</span> if (null != provider) {<a
name="line.209"></a>
-<span class="sourceLineNo">210</span> provider.close();<a
name="line.210"></a>
-<span class="sourceLineNo">211</span> }<a name="line.211"></a>
-<span class="sourceLineNo">212</span> }<a name="line.212"></a>
-<span class="sourceLineNo">213</span><a name="line.213"></a>
-<span class="sourceLineNo">214</span> /**<a name="line.214"></a>
-<span class="sourceLineNo">215</span> * Tell the underlying WAL providers to
shut down, but do not clean up underlying storage.<a name="line.215"></a>
-<span class="sourceLineNo">216</span> * If you are not ending cleanly and
will need to replay edits from this factory's wals,<a name="line.216"></a>
-<span class="sourceLineNo">217</span> * use this method if you can as it
will try to leave things as tidy as possible.<a name="line.217"></a>
-<span class="sourceLineNo">218</span> */<a name="line.218"></a>
-<span class="sourceLineNo">219</span> public void shutdown() throws
IOException {<a name="line.219"></a>
-<span class="sourceLineNo">220</span> IOException exception = null;<a
name="line.220"></a>
-<span class="sourceLineNo">221</span> final WALProvider metaProvider =
this.metaProvider.get();<a name="line.221"></a>
-<span class="sourceLineNo">222</span> if (null != metaProvider) {<a
name="line.222"></a>
-<span class="sourceLineNo">223</span> try {<a name="line.223"></a>
-<span class="sourceLineNo">224</span> metaProvider.shutdown();<a
name="line.224"></a>
-<span class="sourceLineNo">225</span> } catch(IOException ioe) {<a
name="line.225"></a>
-<span class="sourceLineNo">226</span> exception = ioe;<a
name="line.226"></a>
-<span class="sourceLineNo">227</span> }<a name="line.227"></a>
-<span class="sourceLineNo">228</span> }<a name="line.228"></a>
-<span class="sourceLineNo">229</span> provider.shutdown();<a
name="line.229"></a>
-<span class="sourceLineNo">230</span> if (null != exception) {<a
name="line.230"></a>
-<span class="sourceLineNo">231</span> throw exception;<a
name="line.231"></a>
-<span class="sourceLineNo">232</span> }<a name="line.232"></a>
-<span class="sourceLineNo">233</span> }<a name="line.233"></a>
-<span class="sourceLineNo">234</span><a name="line.234"></a>
-<span class="sourceLineNo">235</span> public List<WAL> getWALs() {<a
name="line.235"></a>
-<span class="sourceLineNo">236</span> return provider.getWALs();<a
name="line.236"></a>
-<span class="sourceLineNo">237</span> }<a name="line.237"></a>
-<span class="sourceLineNo">238</span><a name="line.238"></a>
-<span class="sourceLineNo">239</span> /**<a name="line.239"></a>
-<span class="sourceLineNo">240</span> * @param identifier may not be null,
contents will not be altered<a name="line.240"></a>
-<span class="sourceLineNo">241</span> * @param namespace could be null, and
will use default namespace if null<a name="line.241"></a>
-<span class="sourceLineNo">242</span> */<a name="line.242"></a>
-<span class="sourceLineNo">243</span> public WAL getWAL(final byte[]
identifier, final byte[] namespace) throws IOException {<a name="line.243"></a>
-<span class="sourceLineNo">244</span> return provider.getWAL(identifier,
namespace);<a name="line.244"></a>
-<span class="sourceLineNo">245</span> }<a name="line.245"></a>
-<span class="sourceLineNo">246</span><a name="line.246"></a>
-<span class="sourceLineNo">247</span> /**<a name="line.247"></a>
-<span class="sourceLineNo">248</span> * @param identifier may not be null,
contents will not be altered<a name="line.248"></a>
-<span class="sourceLineNo">249</span> */<a name="line.249"></a>
-<span class="sourceLineNo">250</span> public WAL getMetaWAL(final byte[]
identifier) throws IOException {<a name="line.250"></a>
-<span class="sourceLineNo">251</span> WALProvider metaProvider =
this.metaProvider.get();<a name="line.251"></a>
-<span class="sourceLineNo">252</span> if (null == metaProvider) {<a
name="line.252"></a>
-<span class="sourceLineNo">253</span> final WALProvider temp =
getProvider(META_WAL_PROVIDER, DEFAULT_META_WAL_PROVIDER,<a name="line.253"></a>
-<span class="sourceLineNo">254</span>
Collections.<WALActionsListener>singletonList(new MetricsWAL()),<a
name="line.254"></a>
-<span class="sourceLineNo">255</span>
AbstractFSWALProvider.META_WAL_PROVIDER_ID);<a name="line.255"></a>
-<span class="sourceLineNo">256</span> if
(this.metaProvider.compareAndSet(null, temp)) {<a name="line.256"></a>
-<span class="sourceLineNo">257</span> metaProvider = temp;<a
name="line.257"></a>
-<span class="sourceLineNo">258</span> } else {<a name="line.258"></a>
-<span class="sourceLineNo">259</span> // reference must now be to a
provider created in another thread.<a name="line.259"></a>
-<span class="sourceLineNo">260</span> temp.close();<a
name="line.260"></a>
-<span class="sourceLineNo">261</span> metaProvider =
this.metaProvider.get();<a name="line.261"></a>
-<span class="sourceLineNo">262</span> }<a name="line.262"></a>
-<span class="sourceLineNo">263</span> }<a name="line.263"></a>
-<span class="sourceLineNo">264</span> return
metaProvider.getWAL(identifier, null);<a name="line.264"></a>
+<span class="sourceLineNo">090</span> final String factoryId;<a
name="line.90"></a>
+<span class="sourceLineNo">091</span> private final WALProvider provider;<a
name="line.91"></a>
+<span class="sourceLineNo">092</span> // The meta updates are written to a
different wal. If this<a name="line.92"></a>
+<span class="sourceLineNo">093</span> // regionserver holds meta regions,
then this ref will be non-null.<a name="line.93"></a>
+<span class="sourceLineNo">094</span> // lazily intialized; most
RegionServers don't deal with META<a name="line.94"></a>
+<span class="sourceLineNo">095</span> private final
AtomicReference<WALProvider> metaProvider = new
AtomicReference<>();<a name="line.95"></a>
+<span class="sourceLineNo">096</span><a name="line.96"></a>
+<span class="sourceLineNo">097</span> /**<a name="line.97"></a>
+<span class="sourceLineNo">098</span> * Configuration-specified WAL Reader
used when a custom reader is requested<a name="line.98"></a>
+<span class="sourceLineNo">099</span> */<a name="line.99"></a>
+<span class="sourceLineNo">100</span> private final Class<? extends
AbstractFSWALProvider.Reader> logReaderClass;<a name="line.100"></a>
+<span class="sourceLineNo">101</span><a name="line.101"></a>
+<span class="sourceLineNo">102</span> /**<a name="line.102"></a>
+<span class="sourceLineNo">103</span> * How long to attempt opening
in-recovery wals<a name="line.103"></a>
+<span class="sourceLineNo">104</span> */<a name="line.104"></a>
+<span class="sourceLineNo">105</span> private final int timeoutMillis;<a
name="line.105"></a>
+<span class="sourceLineNo">106</span><a name="line.106"></a>
+<span class="sourceLineNo">107</span> private final Configuration conf;<a
name="line.107"></a>
+<span class="sourceLineNo">108</span><a name="line.108"></a>
+<span class="sourceLineNo">109</span> // Used for the singleton WALFactory,
see below.<a name="line.109"></a>
+<span class="sourceLineNo">110</span> private WALFactory(Configuration conf)
{<a name="line.110"></a>
+<span class="sourceLineNo">111</span> // this code is duplicated here so we
can keep our members final.<a name="line.111"></a>
+<span class="sourceLineNo">112</span> // until we've moved reader/writer
construction down into providers, this initialization must<a
name="line.112"></a>
+<span class="sourceLineNo">113</span> // happen prior to provider
initialization, in case they need to instantiate a reader/writer.<a
name="line.113"></a>
+<span class="sourceLineNo">114</span> timeoutMillis =
conf.getInt("hbase.hlog.open.timeout", 300000);<a name="line.114"></a>
+<span class="sourceLineNo">115</span> /* TODO Both of these are probably
specific to the fs wal provider */<a name="line.115"></a>
+<span class="sourceLineNo">116</span> logReaderClass =
conf.getClass("hbase.regionserver.hlog.reader.impl", ProtobufLogReader.class,<a
name="line.116"></a>
+<span class="sourceLineNo">117</span>
AbstractFSWALProvider.Reader.class);<a name="line.117"></a>
+<span class="sourceLineNo">118</span> this.conf = conf;<a
name="line.118"></a>
+<span class="sourceLineNo">119</span> // end required early
initialization<a name="line.119"></a>
+<span class="sourceLineNo">120</span><a name="line.120"></a>
+<span class="sourceLineNo">121</span> // this instance can't create wals,
just reader/writers.<a name="line.121"></a>
+<span class="sourceLineNo">122</span> provider = null;<a
name="line.122"></a>
+<span class="sourceLineNo">123</span> factoryId = SINGLETON_ID;<a
name="line.123"></a>
+<span class="sourceLineNo">124</span> }<a name="line.124"></a>
+<span class="sourceLineNo">125</span><a name="line.125"></a>
+<span class="sourceLineNo">126</span> @VisibleForTesting<a
name="line.126"></a>
+<span class="sourceLineNo">127</span> public Class<? extends
WALProvider> getProviderClass(String key, String defaultValue) {<a
name="line.127"></a>
+<span class="sourceLineNo">128</span> try {<a name="line.128"></a>
+<span class="sourceLineNo">129</span> return
Providers.valueOf(conf.get(key, defaultValue)).clazz;<a name="line.129"></a>
+<span class="sourceLineNo">130</span> } catch (IllegalArgumentException
exception) {<a name="line.130"></a>
+<span class="sourceLineNo">131</span> // Fall back to them specifying a
class name<a name="line.131"></a>
+<span class="sourceLineNo">132</span> // Note that the passed default
class shouldn't actually be used, since the above only fails<a
name="line.132"></a>
+<span class="sourceLineNo">133</span> // when there is a config value
present.<a name="line.133"></a>
+<span class="sourceLineNo">134</span> return conf.getClass(key,
Providers.defaultProvider.clazz, WALProvider.class);<a name="line.134"></a>
+<span class="sourceLineNo">135</span> }<a name="line.135"></a>
+<span class="sourceLineNo">136</span> }<a name="line.136"></a>
+<span class="sourceLineNo">137</span><a name="line.137"></a>
+<span class="sourceLineNo">138</span> WALProvider createProvider(Class<?
extends WALProvider> clazz,<a name="line.138"></a>
+<span class="sourceLineNo">139</span> List<WALActionsListener>
listeners, String providerId) throws IOException {<a name="line.139"></a>
+<span class="sourceLineNo">140</span> LOG.info("Instantiating WALProvider
of type " + clazz);<a name="line.140"></a>
+<span class="sourceLineNo">141</span> try {<a name="line.141"></a>
+<span class="sourceLineNo">142</span> final WALProvider result =
clazz.newInstance();<a name="line.142"></a>
+<span class="sourceLineNo">143</span> result.init(this, conf, listeners,
providerId);<a name="line.143"></a>
+<span class="sourceLineNo">144</span> return result;<a
name="line.144"></a>
+<span class="sourceLineNo">145</span> } catch (InstantiationException
exception) {<a name="line.145"></a>
+<span class="sourceLineNo">146</span> LOG.error("couldn't set up
WALProvider, the configured class is " + clazz);<a name="line.146"></a>
+<span class="sourceLineNo">147</span> LOG.debug("Exception details for
failure to load WALProvider.", exception);<a name="line.147"></a>
+<span class="sourceLineNo">148</span> throw new IOException("couldn't set
up WALProvider", exception);<a name="line.148"></a>
+<span class="sourceLineNo">149</span> } catch (IllegalAccessException
exception) {<a name="line.149"></a>
+<span class="sourceLineNo">150</span> LOG.error("couldn't set up
WALProvider, the configured class is " + clazz);<a name="line.150"></a>
+<span class="sourceLineNo">151</span> LOG.debug("Exception details for
failure to load WALProvider.", exception);<a name="line.151"></a>
+<span class="sourceLineNo">152</span> throw new IOException("couldn't set
up WALProvider", exception);<a name="line.152"></a>
+<span class="sourceLineNo">153</span> }<a name="line.153"></a>
+<span class="sourceLineNo">154</span> }<a name="line.154"></a>
+<span class="sourceLineNo">155</span><a name="line.155"></a>
+<span class="sourceLineNo">156</span> /**<a name="line.156"></a>
+<span class="sourceLineNo">157</span> * instantiate a provider from a config
property.<a name="line.157"></a>
+<span class="sourceLineNo">158</span> * requires conf to have already been
set (as well as anything the provider might need to read).<a
name="line.158"></a>
+<span class="sourceLineNo">159</span> */<a name="line.159"></a>
+<span class="sourceLineNo">160</span> WALProvider getProvider(final String
key, final String defaultValue,<a name="line.160"></a>
+<span class="sourceLineNo">161</span> final
List<WALActionsListener> listeners, final String providerId) throws
IOException {<a name="line.161"></a>
+<span class="sourceLineNo">162</span> Class<? extends WALProvider>
clazz = getProviderClass(key, defaultValue);<a name="line.162"></a>
+<span class="sourceLineNo">163</span> return createProvider(clazz,
listeners, providerId);<a name="line.163"></a>
+<span class="sourceLineNo">164</span> }<a name="line.164"></a>
+<span class="sourceLineNo">165</span><a name="line.165"></a>
+<span class="sourceLineNo">166</span> /**<a name="line.166"></a>
+<span class="sourceLineNo">167</span> * @param conf must not be null, will
keep a reference to read params in later reader/writer<a name="line.167"></a>
+<span class="sourceLineNo">168</span> * instances.<a name="line.168"></a>
+<span class="sourceLineNo">169</span> * @param listeners may be null. will
be given to all created wals (and not meta-wals)<a name="line.169"></a>
+<span class="sourceLineNo">170</span> * @param factoryId a unique identifier
for this factory. used i.e. by filesystem implementations<a name="line.170"></a>
+<span class="sourceLineNo">171</span> * to make a directory<a
name="line.171"></a>
+<span class="sourceLineNo">172</span> */<a name="line.172"></a>
+<span class="sourceLineNo">173</span> public WALFactory(final Configuration
conf, final List<WALActionsListener> listeners,<a name="line.173"></a>
+<span class="sourceLineNo">174</span> final String factoryId) throws
IOException {<a name="line.174"></a>
+<span class="sourceLineNo">175</span> // until we've moved reader/writer
construction down into providers, this initialization must<a
name="line.175"></a>
+<span class="sourceLineNo">176</span> // happen prior to provider
initialization, in case they need to instantiate a reader/writer.<a
name="line.176"></a>
+<span class="sourceLineNo">177</span> timeoutMillis =
conf.getInt("hbase.hlog.open.timeout", 300000);<a name="line.177"></a>
+<span class="sourceLineNo">178</span> /* TODO Both of these are probably
specific to the fs wal provider */<a name="line.178"></a>
+<span class="sourceLineNo">179</span> logReaderClass =
conf.getClass("hbase.regionserver.hlog.reader.impl", ProtobufLogReader.class,<a
name="line.179"></a>
+<span class="sourceLineNo">180</span>
AbstractFSWALProvider.Reader.class);<a name="line.180"></a>
+<span class="sourceLineNo">181</span> this.conf = conf;<a
name="line.181"></a>
+<span class="sourceLineNo">182</span> this.factoryId = factoryId;<a
name="line.182"></a>
+<span class="sourceLineNo">183</span> // end required early
initialization<a name="line.183"></a>
+<span class="sourceLineNo">184</span> if
(conf.getBoolean("hbase.regionserver.hlog.enabled", true)) {<a
name="line.184"></a>
+<span class="sourceLineNo">185</span> provider =
getProvider(WAL_PROVIDER, DEFAULT_WAL_PROVIDER, listeners, null);<a
name="line.185"></a>
+<span class="sourceLineNo">186</span> } else {<a name="line.186"></a>
+<span class="sourceLineNo">187</span> // special handling of existing
configuration behavior.<a name="line.187"></a>
+<span class="sourceLineNo">188</span> LOG.warn("Running with WAL
disabled.");<a name="line.188"></a>
+<span class="sourceLineNo">189</span> provider = new
DisabledWALProvider();<a name="line.189"></a>
+<span class="sourceLineNo">190</span> provider.init(this, conf, null,
factoryId);<a name="line.190"></a>
+<span class="sourceLineNo">191</span> }<a name="line.191"></a>
+<span class="sourceLineNo">192</span> }<a name="line.192"></a>
+<span class="sourceLineNo">193</span><a name="line.193"></a>
+<span class="sourceLineNo">194</span> /**<a name="line.194"></a>
+<span class="sourceLineNo">195</span> * Shutdown all WALs and clean up any
underlying storage.<a name="line.195"></a>
+<span class="sourceLineNo">196</span> * Use only when you will not need to
replay and edits that have gone to any wals from this<a name="line.196"></a>
+<span class="sourceLineNo">197</span> * factory.<a name="line.197"></a>
+<span class="sourceLineNo">198</span> */<a name="line.198"></a>
+<span class="sourceLineNo">199</span> public void close() throws IOException
{<a name="line.199"></a>
+<span class="sourceLineNo">200</span> final WALProvider metaProvider =
this.metaProvider.get();<a name="line.200"></a>
+<span class="sourceLineNo">201</span> if (null != metaProvider) {<a
name="line.201"></a>
+<span class="sourceLineNo">202</span> metaProvider.close();<a
name="line.202"></a>
+<span class="sourceLineNo">203</span> }<a name="line.203"></a>
+<span class="sourceLineNo">204</span> // close is called on a WALFactory
with null provider in the case of contention handling<a name="line.204"></a>
+<span class="sourceLineNo">205</span> // within the getInstance method.<a
name="line.205"></a>
+<span class="sourceLineNo">206</span> if (null != provider) {<a
name="line.206"></a>
+<span class="sourceLineNo">207</span> provider.close();<a
name="line.207"></a>
+<span class="sourceLineNo">208</span> }<a name="line.208"></a>
+<span class="sourceLineNo">209</span> }<a name="line.209"></a>
+<span class="sourceLineNo">210</span><a name="line.210"></a>
+<span class="sourceLineNo">211</span> /**<a name="line.211"></a>
+<span class="sourceLineNo">212</span> * Tell the underlying WAL providers to
shut down, but do not clean up underlying storage.<a name="line.212"></a>
+<span class="sourceLineNo">213</span> * If you are not ending cleanly and
will need to replay edits from this factory's wals,<a name="line.213"></a>
+<span class="sourceLineNo">214</span> * use this method if you can as it
will try to leave things as tidy as possible.<a name="line.214"></a>
+<span class="sourceLineNo">215</span> */<a name="line.215"></a>
+<span class="sourceLineNo">216</span> public void shutdown() throws
IOException {<a name="line.216"></a>
+<span class="sourceLineNo">217</span> IOException exception = null;<a
name="line.217"></a>
+<span class="sourceLineNo">218</span> final WALProvider metaProvider =
this.metaProvider.get();<a name="line.218"></a>
+<span class="sourceLineNo">219</span> if (null != metaProvider) {<a
name="line.219"></a>
+<span class="sourceLineNo">220</span> try {<a name="line.220"></a>
+<span class="sourceLineNo">221</span> metaProvider.shutdown();<a
name="line.221"></a>
+<span class="sourceLineNo">222</span> } catch(IOException ioe) {<a
name="line.222"></a>
+<span class="sourceLineNo">223</span> exception = ioe;<a
name="line.223"></a>
+<span class="sourceLineNo">224</span> }<a name="line.224"></a>
+<span class="sourceLineNo">225</span> }<a name="line.225"></a>
+<span class="sourceLineNo">226</span> provider.shutdown();<a
name="line.226"></a>
+<span class="sourceLineNo">227</span> if (null != exception) {<a
name="line.227"></a>
+<span class="sourceLineNo">228</span> throw exception;<a
name="line.228"></a>
+<span class="sourceLineNo">229</span> }<a name="line.229"></a>
+<span class="sourceLineNo">230</span> }<a name="line.230"></a>
+<span class="sourceLineNo">231</span><a name="line.231"></a>
+<span class="sourceLineNo">232</span> public List<WAL> getWALs() {<a
name="line.232"></a>
+<span class="sourceLineNo">233</span> return provider.getWALs();<a
name="line.233"></a>
+<span class="sourceLineNo">234</span> }<a name="line.234"></a>
+<span class="sourceLineNo">235</span><a name="line.235"></a>
+<span class="sourceLineNo">236</span> private WALProvider getMetaProvider()
throws IOException {<a name="line.236"></a>
+<span class="sourceLineNo">237</span> for (;;) {<a name="line.237"></a>
+<span class="sourceLineNo">238</span> WALProvider provider =
this.metaProvider.get();<a name="line.238"></a>
+<span class="sourceLineNo">239</span> if (provider != null) {<a
name="line.239"></a>
+<span class="sourceLineNo">240</span> return provider;<a
name="line.240"></a>
+<span class="sourceLineNo">241</span> }<a name="line.241"></a>
+<span class="sourceLineNo">242</span> provider =
getProvider(META_WAL_PROVIDER, DEFAULT_META_WAL_PROVIDER,<a name="line.242"></a>
+<span class="sourceLineNo">243</span>
Collections.<WALActionsListener> singletonList(new MetricsWAL()),<a
name="line.243"></a>
+<span class="sourceLineNo">244</span>
AbstractFSWALProvider.META_WAL_PROVIDER_ID);<a name="line.244"></a>
+<span class="sourceLineNo">245</span> if
(metaProvider.compareAndSet(null, provider)) {<a name="line.245"></a>
+<span class="sourceLineNo">246</span> return provider;<a
name="line.246"></a>
+<span class="sourceLineNo">247</span> } else {<a name="line.247"></a>
+<span class="sourceLineNo">248</span> // someone is ahead of us, close
and try again.<a name="line.248"></a>
+<span class="sourceLineNo">249</span> provider.close();<a
name="line.249"></a>
+<span class="sourceLineNo">250</span> }<a name="line.250"></a>
+<span class="sourceLineNo">251</span> }<a name="line.251"></a>
+<span class="sourceLineNo">252</span> }<a name="line.252"></a>
+<span class="sourceLineNo">253</span><a name="line.253"></a>
+<span class="sourceLineNo">254</span> /**<a name="line.254"></a>
+<span class="sourceLineNo">255</span> * @param region the region which we
want to get a WAL for it. Could be null.<a name="line.255"></a>
+<span class="sourceLineNo">256</span> */<a name="line.256"></a>
+<span class="sourceLineNo">257</span> public WAL getWAL(RegionInfo region)
throws IOException {<a name="line.257"></a>
+<span class="sourceLineNo">258</span> // use different WAL for hbase:meta<a
name="line.258"></a>
+<span class="sourceLineNo">259</span> if (region != null &&
region.isMetaRegion() &&<a name="line.259"></a>
+<span class="sourceLineNo">260</span> region.getReplicaId() ==
RegionInfo.DEFAULT_REPLICA_ID) {<a name="line.260"></a>
+<span class="sourceLineNo">261</span> return
getMetaProvider().getWAL(region);<a name="line.261"></a>
+<span class="sourceLineNo">262</span> } else {<a name="line.262"></a>
+<span class="sourceLineNo">263</span> return provider.getWAL(region);<a
name="line.263"></a>
+<span class="sourceLineNo">264</span> }<a name="line.264"></a>
<span class="sourceLineNo">265</span> }<a name="line.265"></a>
<span class="sourceLineNo">266</span><a name="line.266"></a>
<span class="sourceLineNo">267</span> public Reader createReader(final
FileSystem fs, final Path path) throws IOException {<a name="line.267"></a>
